TelegramBotAPI-examples/ForwarderBot/src/main/kotlin/ForwarderBot.kt

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Kotlin
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import dev.inmo.tgbotapi.extensions.api.send.sendTextMessage
import dev.inmo.tgbotapi.extensions.api.telegramBot
import dev.inmo.tgbotapi.extensions.utils.formatting.codeMarkdownV2
import dev.inmo.tgbotapi.extensions.utils.formatting.regularMarkdownV2
import dev.inmo.tgbotapi.extensions.utils.safely
import dev.inmo.tgbotapi.extensions.utils.updates.asContentMessagesFlow
import dev.inmo.tgbotapi.extensions.utils.updates.retrieving.startGettingFlowsUpdatesByLongPolling
import dev.inmo.tgbotapi.types.ParseMode.MarkdownV2
import dev.inmo.tgbotapi.types.message.*
import dev.inmo.tgbotapi.types.message.abstracts.PossiblyForwardedMessage
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import kotlinx.coroutines.*
import kotlinx.coroutines.flow.*
/**
* This bot will always return message about forwarder. In cases when sent message was not a forward message it will
* send suitable message
*/
suspend fun main(vararg args: String) {
val botToken = args.first()
val bot = telegramBot(botToken)
val scope = CoroutineScope(Dispatchers.Default)
bot.startGettingFlowsUpdatesByLongPolling(scope = scope) {
messageFlow.asContentMessagesFlow().mapNotNull { it as? PossiblyForwardedMessage }.onEach { message ->
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safely({ it.printStackTrace() }) {
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val toAnswer = when (val forwardInfo = message.forwardInfo) {
null -> "There is no forward info"
is AnonymousForwardInfo -> "Anonymous user which signed as \"${forwardInfo.senderName.codeMarkdownV2()}\""
is UserForwardInfo -> forwardInfo.from.let { user ->
"User ${user.id.chatId.toString().codeMarkdownV2()} " + "(${user.firstName} ${user.lastName}: ${user.username ?.username ?: "Without username"})".regularMarkdownV2()
}
is ForwardFromChannelInfo -> "Channel (".regularMarkdownV2() + (forwardInfo.channelChat).title.codeMarkdownV2() + ")".regularMarkdownV2()
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is ForwardFromSupergroupInfo -> "Supergroup (".regularMarkdownV2() + (forwardInfo.group).title.codeMarkdownV2() + ")".regularMarkdownV2()
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}
bot.sendTextMessage(message.chat, toAnswer, MarkdownV2)
}
}.launchIn(scope)
}
scope.coroutineContext[Job]!!.join()
}